gager
/ˈɡeɪdʒər/
noun
- A person or device that measures or estimates the amount, level, or capacity of something, such as fuel, pressure, or distance.
- As a gager at the oil refinery, Maria checks the levels in storage tanks every morning.
- The old water gager in the basement needed to be replaced because it was leaking.
- The fuel gager on the dashboard showed the tank was almost empty.